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Derivatives and hedge accounting - Gross carrying value of derivatives designated under fair value hedge accounting (Details) - Derivatives - -  fair value hedges - Interest rate risk - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
– Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets € 3,011 € 2,750
Hedging instrument, liabilities 6,410 8,047
– Other interest derivatives    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 284 395
Hedging instrument, liabilities € 34 € 39